DNA replication is the process that your cells use to copy their genetic blueprint. This occurs every time cells divide, so that each new cell has a complete set of instructions. The process involves unzipping the two complementary strands of the parent DNA, and then using free nucleic acids and an enzyme called a DNA polymerase to construct new strands to pair up with each of the parent strands.
Polymerase Chain Reaction, or PCR, is a process to run this replication artificially in a laboratory. This is often used to analyze DNA samples. Typically analysts get only a very small amount of a DNA sample, and by using PCR they can create a large amount of identical DNA to study. This might be used to identify a blood sample or other evidence at a crime scene, in something like paternity testing, or to identify the DNA of a bacteria or virus to diagnose disease. The Abbott m2000(R) is an automated instrument to run PCR testing to identify various disease agents. Dave and John from briXwerX have made a number of m2000 models on commission for Abbot Molecular.